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HelicopterAlignT-REX 700N › 7.66 ratio is too low
01-30-2012 04:19 AM  6 years agoPost 1
Glenn Goodlett

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California

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The 7.66 gear ratio is too low, for me anyway. I still fly with a fly bar and this ratio is just too low for my piss poor collective management skills.

My YS 1.20 is running fantastic and I have settled on running a ratio of 8.0 which gives me a headspeed of 2050 at 16400rpm.

Maybe I'll revisit the 7.66 ratio after I go flybarless next month. So this leaves me with a 15 tooth pinion that I don't need. If anyone wants it, let me know.

Glenn

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01-30-2012 06:08 PM  6 years agoPost 2
aliosha323

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Los Angeles, California

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pm'd

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01-30-2012 07:15 PM  6 years agoPost 3
Four Stroker

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Atlanta

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Glenn;

How are you getting a 8.0 gear ratio ? What Mod ?

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01-31-2012 06:16 AM  6 years agoPost 4
Glenn Goodlett

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To get an 8.0 ratio, I use the 112 tooth helical cut main gear and a 14 tooth helical cut pinion. I got the pinion from Fast Lad but now I see ExperianceRC has them. This setup is also quieter than straight gears.

I also use the G force adjustable clutch block and adjustable motor mounts to set the mesh.

Glenn

P.S. I already gave the 15 tooth pinion away.

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01-31-2012 01:38 PM  6 years agoPost 5
Four Stroker

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Thanks Glenn;

Let us know how the helical gears hold up with the 120. I know electrics are producing twice the HP, but I am interested in the impulse firing of the nitro engine.

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01-31-2012 05:49 PM  6 years agoPost 6
knightofcarnage

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chicago

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To get an 8.0 ratio, I use the 112 tooth helical cut main gear and a 14 tooth helical cut pinion. I got the pinion from Fast Lad but now I see ExperianceRC has them. This setup is also quieter than straight gears.
I also use the G force adjustable clutch block and adjustable motor mounts to set the mesh.
Glenn
can you provide a link please

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01-31-2012 07:01 PM  6 years agoPost 7
Glenn Goodlett

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I have been running the helical gears for about a week throwing everything the YS 1.20 has at them. No problems so far.

Here's a link to the pinion
http://www.fast-lad.co.uk/store/bevel_engine_gear_(700n)_10220841-p-14814.htm

The main gear is the 112 tooth slant gear for the 700e.

Glenn

P.S. The link above does not work right. I don't know why, but it gets you o the right site.

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01-31-2012 07:17 PM  6 years agoPost 8
knightofcarnage

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I got thanks. How did you get a 15T pinion ?

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01-31-2012 08:07 PM  6 years agoPost 9
Four Stroker

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It's on the Experience RC main page under new products a little bit down.

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02-01-2012 03:01 AM  6 years agoPost 10
knightofcarnage

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Hmm i only found the 14T. Don't see a 15T.

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02-02-2012 08:02 PM  6 years agoPost 11
Glenn Goodlett

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14 tooth is what you want with a 112 tooth main gear. A 15 tooth pinion with a 112 tooth main would yield a ratio of 7.47, which is too low.

Glenn

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02-02-2012 10:12 PM  6 years agoPost 12
knightofcarnage

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I know that it gives too low with 700E main gear but M1 from 700N you get 7.66 (115/15) but only problem is M1 gear from 700N is not slanted. Looks like for now i will go with 8.0. I just want keep the HS above 2k under load, so there is no issues with DFC head.

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02-03-2012 04:59 PM  6 years agoPost 13
Four Stroker

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Atlanta

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Well Glenn;

I ordered two 15T pinions. I am going to attemp to make a pinion on my toy lathe. I ordered two so I can "un-harden" one if absolutely necessary. Have some new solid carbide micro boring bars from McMaster.

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02-03-2012 06:22 PM  6 years agoPost 14
Glenn Goodlett

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California

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I think the gears are case hardened so once you break through they cut like butter. I just used a short cobalt 10mm drill bit and did not have a problem.

I've never seen a boring bar small enough to make a 10 mm hole. Post a photo if it's not much trouble.

Glenn

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02-03-2012 09:27 PM  6 years agoPost 15
Four Stroker

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Atlanta

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Down the page a little: Small-Diameter Boring Bars

http://www.mcmaster.com/#boring-bars/=g3bnmv

Well I did the easy part today:

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02-03-2012 11:08 PM  6 years agoPost 16
BOOGIE

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LAFAYETTE LA

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Nice! Four Stroker let us know how it goes I need one also and have been thinking anout buying a Toy Lathe

MSH USA / Lynx Heli Innovations

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02-03-2012 11:23 PM  6 years agoPost 17
Glenn Goodlett

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California

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I did the other way around. I bored out the pinion and then turned down the nitro pinion to fit the bored out one. I guess it does not matter.

Once I got the two sized right, I put the nitro pinion in the lathe chuck and used the tail stock to press the two together. I used little heat as I didn't want to screw up the tempering. I also used some permanent thread locker just for good measure.

Actually, in my opinion you have the hardest part done. It's down hill from here.

Glenn

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02-04-2012 12:07 AM  6 years agoPost 18
Four Stroker

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Atlanta

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People don't realize that these engines only put out a few ft-lbs of torque. A .60 about 0.7 ft-lbs according to Peter Chinn, so even if you double this with a 1.20, maybe 1.5 ft-lbs. A Sullivan Dynatron on 24 volts is about 3.5 ft-lbs.

My point is that the press fit doesn't have to be that good. Loctite helps ! When I screwed up in the past and didn't have a press fit, I used JB Weld.

The Align pinion is not hardened in any way. I will probably de-temper the 15T pinion before I start cutting.

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02-07-2012 12:21 AM  6 years agoPost 19
Four Stroker

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Atlanta

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Well you can make a pinion on a toy lathe. But NOT A HARDENED ONE. Trying to cut the hardened gear was rediculous. After "un-hardening" the gear all went relatively smoothly.

The press fit was tighter than I usually get. It ain't going anywhere. Bought the 115 CNC gear to go with it.

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02-07-2012 03:57 AM  6 years agoPost 20
knightofcarnage

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chicago

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Four can i hire you to make me one?

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HelicopterAlignT-REX 700N › 7.66 ratio is too low
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